<mat-form-field class="example-full-width">
  <input matInput [matDatepicker]="picker" placeholder="Choose a date">
  <mat-datepicker-toggle matSuffix [for]="picker">
    <mat-icon matDatepickerToggleIcon>keyboard_arrow_down</mat-icon>
  </mat-datepicker-toggle>
  <mat-datepicker #picker></mat-datepicker>
</mat-form-field>
